Hi, I am attempting to make some bows for a Windsor type chair and need some help. The apparatus consists of a wallpaper steamer conncted to a steel tube 2 metres long and 8cm diameter lagged with an old sleeping bag. The material I am attempting to bend is freshly cut sweet chestnut and ash about 3cm diameter, steamed for about 1 hour. So far the poles have all broken as I turn them around the former. Can anyone suggest what I should be doing?